LY5 Compression Ratio

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08-05-2012 | 08:14 PM

Jake Wade

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From: Louisiana

LY5 Compression Ratio

Does the '07-up Gen 4 5.3 truck engines have 9.5 or 9.9 CR?

I have seen it listed both ways on different sights.

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08-06-2012 | 08:03 AM

1994Vmax

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It's 9.9:1. Flat top pistons and 243/799 heads like the Gen 3 L33.

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08-06-2012 | 08:12 AM

smokeshow

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I thought my LY5 was 9.5?

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08-06-2012 | 08:40 AM

1994Vmax

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Nope, like I said originally. Flat top pistons with 243/799 heads equals 9.9:1.

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08-06-2012 | 05:32 PM

Jake Wade

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Staging Lane

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From: Louisiana

Cool, thanks for the info

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